西昆仑山前的柯克亚褶皱冲断带，经历了加里东期、印支期和喜山期等多期构造变形的叠加和改造。塔西南盆地多期构造变形叠加与变形机制的揭示可为地震构造的解释和构造模型的建立提供重要的约束。文章运用物理模拟实验，对塔西南柯克亚褶皱冲断带的两期叠加变形过程进行了系统研究，设计了不同滑脱层组合的实验方案，分析讨论多期构造变形
的叠加机制、滑脱层性质差异以及新生代同构造生长地层对变形的影响。得到如下结论：（1）同构造生长地层对变形前陆传播具有正向驱动作用，其通过抑制深部断层向地表的突破，强化浅层滑脱层的构造解耦效应，促使应变能更有效地向前陆远端传递；（2）第二期断层发育表现出良好的继承性，优先选择再活化第一期的先存断层；（3）物理模拟与地质剖面的对比分析表明，深部脆性—浅部韧性滑脱层且两期挤压叠加的耦合模型精确表征了昆仑山前柯克亚构造带的变形特征，塑造了深部发育基底叠瓦扇构造系统、浅部发育被动顶板薄皮构造体系的分层构造格局。

The Kekeya fold-and-thrust belt (Kekeya FTB) at the front of the West Kunlun Range underwent multiple phases of
tectonic deformation and reworking during the Caledonian, Indosinian, and Himalayan periods. Unraveling the mechanisms of superimposed deformation in the southwestern Tarim Basin could provide crucial constraints for seismic interpretation and structural modeling. This study systematically investigates the two-phase superimposed deformation of the Kekeya FTB using analogue modeling. We designed experimental series with varying décollement configurations to evaluate the effects of tectonic superposition, décollement rheology, and Cenozoic syntectonic growth strata. The main conclusions are: (1) Syntectonic growth strata facilitate the propagation of deformation toward the foreland by inhibiting the surface breakthrough of deep-seated faults. This process enhances the decoupling effect of shallow décollements, allowing for more efficient strain transmission to the distal foreland; (2) Second-phase faults exhibit strong structural inheritance, preferentially reactivating pre-existing first-phase faults; (3)
Comparisons between experimental results and geological cross-sections demonstrate that a coupled model involving a deep brittle and shallow ductile décollement under two-phase compression accurately reproduces the structural geometry of the Kekeya FTB. This deformation results in a stratified architecture comprising a deep basement imbricate fan system and a shallow passive-roof thin-skinned system.